SDG #099 IanScottJohnston's PDVS2mini Precision Voltage Source

The PDVS2mini is a compact bench reference from Ian Johnston that generates a precisely settable DC voltage, plus a current source mode, in a package small enough to sit alongside a multimeter rather than take up a whole shelf. This video walks through what the unit is, how it is put together, and where it fits in a hobbyist or repair bench workflow.

The interesting part of a product like this is not raw specification but usability. A precision voltage source lives or dies on how quickly you can dial in an exact value, how stable that value stays as the unit warms up and as load changes, and how trustworthy the displayed number is against a known-good reference meter. Those are the practical questions covered here, along with the resolution available across the output ranges and how the controls behave when you need small increments rather than large jumps.

Because this is a kit-derived design rather than a mass produced instrument, construction and component choice matter. The review looks at the board, the enclosure and the general finish, which is where small-run products often either impress or disappoint. For anyone calibrating ADC inputs, checking meter accuracy, testing sensor front ends, or feeding a known stimulus into an analogue circuit, the value proposition is straightforward: a dedicated reference is far more convenient than borrowing a bench supply and trimming it by hand.

Worth watching if you have been weighing up a small precision source against a higher end bench PSU, or if you are curious how well an independently designed instrument stacks up against commercial gear.